211221023321 has 12 divisors (see below), whose sum is σ = 268043006160. Its totient is φ = 164587809960.

The previous prime is 211221023291. The next prime is 211221023399. The reversal of 211221023321 is 123320122112.

It is a de Polignac number, because none of the positive numbers 2^k-211221023321 is a prime.

It is a super-2 number, since 2×211221023321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221023293 and 211221023302.

It is not an unprimeable number, because it can be changed into a prime (211221023021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195937331 + ... + 195938408.

It is an arithmetic number, because the mean of its divisors is an integer number (22336917180).

Almost surely, 2^211221023321 is an apocalyptic number.

It is an amenable number.

211221023321 is a deficient number, since it is larger than the sum of its proper divisors (56821982839).

211221023321 is a wasteful number, since it uses less digits than its factorization.

211221023321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391875764 (or 391875757 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211221023321 its reverse (123320122112), we get a palindrome (334541145433).

The spelling of 211221023321 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-three thousand, three hundred twenty-one".